That doesn't really answer the question of why God apparently heals (according to the Bible) blindness, muteness (IIRC), mental illness/demonic posession, leprosy, lameness, palsy (IIRC), actual death, etc., etc., but never, either in the Bible or in all of recorded history, re-grows a limb. Ever.
Your article compared God's rejection of some requests to a parent saying "no" to things that a child wanted, but were harmful.
If having four working limbs is the equivalent of having marshmallows for dinner, maybe we should all be sharpening our hacksaws, no?